Repair Facility Research Articles

The U.S. shipbuilding and repair industry’s considerations of coastal hazards resilience - a baseline survey

ABSTRACT Climate change and associated coastal hazards can disrupt the United States shipbuilding and repair industry’s operations. These disruptions present risks to military and commercial ship orders, ship maintenance and repairs, and the nation’s overall shipbuilding strength. Through an online survey of representatives from 45 shipbuilding parent companies, individual shipyards, and ship repair and maintenance facilities, this research gauges how the industry considers coastal hazard resilience and addresses the possible impacts on shipbuilding and repair contracts and deliverables. Survey results suggest that the industry is ill-prepared for future coastal hazard events and that critical measures are needed to ensure a resilient shipbuilding and repair environment.

ANALYSIS OF THE FACTORS AFFECTING THE COST OF SHIP REPAIRS IN THE ISLAND OF JAVA AND KALIMANTAN

The national shipbuilding industry is primarily responsible for maintaining and repairing ships at ship repair facilities to ensure their seaworthiness. Each shipyard offers variable pricing for ship repair, mainly if the work is performed on different islands, in Java and outside of Java. By understanding the differences in ship repair costs between shipyards in Java and those outside of Java and the factors that influence these discrepancies, a ship owner can choose a repair shipyard for docking his vessel. Ship repair data were collected from shipyards in Java and Kalimantan, with data collection and direct surveys conducted at three Industries which are located in the island of Java, and three industries in Kalimantan Island, it is processed to determine the difference between the average cost of ship repairs at shipyards in Java Island and Kalimantan Island, revealing that the cost of repairing ships at shipyards in Java Island is higher than the cost of repairs at shipyards on Kalimantan Island. However, there are also increased costs associated with ship maintenance activities in shipyards in the island of Kalimantan. After processing the difference data, the identification of the factors that cause the difference in repair costs forms, and the identification results indicate that the difference in ship repair costs at the shipyards in Java and Kalimantan is influenced by differences in service costs, productivity figures, geographical location of the shipyards, supply chains. materials, as well as the completeness, quality, and capacity of repair support facilities at the shipyards.

Transient analysis and reliability modeling of fault-tolerant system operating under admission control policy with double retrial features and working vacation

Maintaining a high-level reliability and efficiency without interruption are the key concerns for many real-time machining systems. Using the redundancy and repair facility features, we develop a double retrial orbit queueing model for the fault-tolerant machining system (FTMS) operating under the restriction of admission of repair jobs based on threshold policy and working vacation. The provision of primary and secondary orbits is made so that the failed units can wait there based on the facility available in case the repairman is occupied. From the orbits, the failed units retry to get the repairman free so that the repair job can be accomplished. Chapman–Kolmogorov equations for the system states of FTMS have been constructed to evaluate the transient reliability and queueing indices using the spectral technique. The sensitivity along with the relative sensitivity analysis of crucial system parameters, have facilitated. The impacts of parameter variability on the system metrics and total expected cost are examined for illustrative examples.

Operational Performance of Fish Landing Base (PPI) Lappa Sinjai Regency

This study aims to analyze the level of operational perfomance the fishing port clas PPI Lappa of Sinjai Regency. The research method used in a case study with the aspects studied include the provision of facilities used in PPI Lappa operational activities. Data were analyzed descriptively using the scoring method and operational performance appraisal table. The performance assessment is obtained by comparing the current condition of PPI Lappa with the provisions in the regulations stipulated of The Ministry of Maratime Affairs and Fisheries No. PER.08/MEN/2012 concerning fishing ports and the decision of the Director General of Capture Fisheries No.432/DPT3/0T.220.D3/I/2008 regarding guidelines for evaluating the performance of fishing port technical implementing units. The results of the study show that the performance of coconut PPI Lappa is 63,6 % or good performance status. Each parameter has a high percentage of weight and value success, includes the number of produnction 960,05%, ship visting frequensy 73,3%, ice service 458,10 %, fuel service ships 175,40%, clean water service 22,05% and the availability of port fasilities such as administration office, national marketing, marketing facilities, canteen, and mosque. The facilities available but not functioning are the guard post. Facilities that are not available, such as industrial facilities, processing facilities, ship repair facilities, supply facilities for engine parts and polyclinics.

Stochastic Analysis of Markov Chain Model with different Types of Repair Facility

Stochastic Analysis of Markov Chain Model with different Types of Repair Facility

MMAPs to Model Complex Multi-State Systems with Vacation Policies in the Repair Facility

Two complex multi-state systems subject to multiple events are built in an algorithmic and computational way by considering phase-type distributions and Markovian arrival processes with marked arrivals. The internal performance of the system is composed of different degradation levels and internal repairable and non-repairable failures can occur. Also, the system is subject to external shocks that may provoke repairable or non-repairable failure. A multiple vacation policy is introduced in the system for the repairperson. Preventive maintenance is included in the system to improve the behaviour. Two types of task may be performed by the repairperson; corrective repair and preventive maintenance. The systems are modelled, the transient and stationary distributions are built and different performance measures are calculated in a matrix-algorithmic form. Cost and rewards are included in the model in a vector matrix way. Several economic measures are worked out and the net reward per unit of time is used to optimize the system. A numerical example shows that the system can be optimized according to the existence of preventive maintenance and the distribution of vacation time. The results have been implemented computationally with Matlab and R (packages: expm, optim).

The system of evaluation of the repair facilities of an industrial enterprise

The system of evaluation of the repair facilities of an industrial enterprise

Reliability modeling and analysis for linear consecutive-[formula omitted]-out-of-[formula omitted]: F retrial systems with two maintenance activities

This paper focuses on a linear consecutive-k-out-of-n: F repairable retrial system with an unreliable repair facility, in which preventive maintenance (PM) and repair for working breakdowns are considered for the repair facility. When a component fails, it can be repaired immediately if the repair facility is idle. Otherwise, the failed one would enter the retrial orbit and try again according to the first in first out. Based on repair priority of key components, the steady-state probabilities of the system are derived by using Markov process theory and Crammer’s rule. We analytically calculate steady-state indexes such as steady-state availability, steady-state failure frequency, and mean cycle time of the system. Furthermore, the Runge–Kutta method and the Laplace transform method are employed to obtain the reliability function and the mean time to first failure (MTTFF). Moreover, cost-effectiveness ratio (CER) analysis of the system is provided. Numerical experiments are conducted to illustrate the developed system model and perform influence analysis of PM on steady-state availability and CER for the models with and without PM.

THE DOCK ESTABLISHMENT TO SUPPORT MARITIME SECURITY OPERATIONS IN BANGKA BELITUNG

Navy Base of Bangka Belitung is a type B Navy Base under the operation of Main Navy Base III Jakarta. As a base, it has an important role in the series of Integrated Fleet Weapon Systems (Sistem Senjata Armada Terpadu, SSAT). Nave Base of Bangka Belitung has the main task of supporting administration and logistics for operation elements. Besides that, it plays the role of a unit that enforces the law and maintains maritime security, and also plays an active role in empowering the marine defense area. The port is an important facility in supporting the presence of navy elements that can provide a deterrence effect against threats to maritime security. However, the absence of a dock at Bangka Belitung Navy Base will limit the power of the navy element, that is why the process of law enforcement at sea will be carried out optimally with the presence of a dock. The purpose of this study was to analyze the dock establishment to support the navy power in Bangka Belitung Navy Base securing its maritime area. The theories used were sea power theory, maritime security, dock concept, and International Ship and Port Security Code (ISPS Code). This study used the literature review method, primary data obtained through important files related to the object of research and supported by secondary data in the form of books, journals, and documents related to the construction of the Navy Base of Bangka Belitung. The results showed that the dock can improve the performance of Bangka Belitung Navy Base elements in the support function of anchorage facilities, support for ship maintenance and repair facilities as well as support for supply facilities, support for law enforcement, and maintaining maritime security, as well as empowering marine areas

A System with Two Spare Units, Two Repair Facilities, and Two Types of Repairers

Assuming exponential lifetime and repair time distributions, we study the limiting availability A∞ as well as the per unit time-limiting profit ω of a one-unit system having two identical, cold standby spare units using semi-Markov processes. The failed unit is repaired either by an in-house repairer within an exponential patience time T or by an external expert who works faster but charges more. When there are two repair facilities, we allow the regular repairer to begin repair or to continue repair beyond T if the expert is busy. Two models arise accordingly as the expert repairs one or all failed units during each visit. We show that (1) adding a second spare to a one-unit system already backed by a spare raises A∞ as well as ω; (2) thereafter, adding a second repair facility improves both criteria further. Finally, we determine whether the expert must repair one or all failed units to maximize these criteria and fulfill the maintenance management objectives better than previously studied models.

METHODS OF CONTROL AND DIAGNOSTICS OF PRODUCTS FROM REACTOPLASTES (BRAKE PADS)

The paper describes the existing directions and features in the field of non-destructive testing of thermosetting plastic products, in particular, brake pads of freight cars. The article presents defects that lead to a decrease in the declared resource of wheelsets as a result of interaction with the brake pad during operation. The process of enveloping metal is described. Describes production data provided by railcar repair companies, accompanied by illustrative material. Analyzed are methods of non-destructive testing, the use of which will reduce the damage to wheelsets, by selective testing of brake pads from each batch supplied to a repair facility or plant. Conclusions and tasks for further research are formed.

Optimization of retrial queue with unreliable servers subject to imperfect coverage and reboot delay

ABSTRACT A retrial queue with constant retrial policy, unreliable servers and the failed servers may not be detected is investigated in this paper. Upon arrival, a customer either is attended to one of the available servers or enters a retrial orbit and retries in a random time as all servers are not available. The unreliable server can be breakdown when he is working. The breakdown server may not be detected due to some fault matters. Under such a situation, the repair facility will issue a reboot operation to locate the non-detected breakdown server. Once the breakdown server is detected and located, he will be sent for repair. After utilizing the general theory of matrix-geometric approach to determine the stationary distribution, some performance measures are proposed. A single-objective model aiming at minimizing the average cost is constructed. We apply particle swarm optimization algorithm and genetic algorithm to find the optimum combination of parameters. We also formulate a bi-objective model aiming at minimizing the expect cost and the mean waiting time of customers in orbit. Two multi-objective algorithms are developed to solve it.

Decision making of maritime development scenario on the impact of naval base for supporting navy ships operations

The Indonesian Navy is the spearhead in maintaining maritime security in Indonesian waters. In carrying out its main tasks, the Indonesian Navy has components of an Integrated Fleet Weapon System in which there are elements of Ships and Naval Bases. To ensure the effectiveness of carrying out operations by ship elements, ship operations are supported by the Naval Base as the organizer of the support function. Naval Base's carrying capacity consists of 5 (five) support functions, including: (1) support for anchoring facilities; (2) support for supply facilities; (3) support for maintenance and repair facilities; (4) support facility maintenance personnel; and (5) support for base development facilities. Naval Base does not yet have its dock to support anchoring facilities for ship operations. In addition to cooperation in the use of the Naval Base anchorage facility, there is also cooperation in port security, both in terms of land and port water aspects. As the number of ship visits at Naval Base Harbor increases, the dock utility increases. The increase in dock utility resulted in a decrease in port services which also resulted in a decrease in the Naval Base Carrying Capacity. To improve port services, Pelindo III implements the port development program contained in the Naval Base Port Master Plan in Permen KP number 792 of 2017. In this study, an analysis of the impact of the Naval Base Port development policy on the carrying capacity of the Naval Base was carried out. The data analysis uses System Dynamics modeling with a simulation period of 30 years in 3 development scenarios, namely short-term scenarios, medium-term scenarios, and long-term scenarios. From the simulation results, it is found that the construction of the Naval Base port affects the Naval Base Carrying Capacity with an average increase of 1.8% in each policy scenario. The increase in Naval Base Carrying Capacity has an effect on increasing Ship Operations by an average of 1.8% and also increasing the Security of Naval Base Harbor by an average of 0.14%. The results of the analysis of this study can be used as consideration for policymaking by the Navy.

Rice Transplanting Mechanization in Bangladesh: Way to Make it Sustainable

“Rice transplanter” has brought a radical change in the method of rice seedlings transplanting in Bangladesh. The machine is gaining popularity with the increase of labor crisis during the peak period of transplanting, reduction time of in-between crops, rapid urbanization and industrialization, and changing socio-economic status of the farmers. Alternatively, the traditional way of rice transplanting is labor-intensive and involves high drudgery. Mechanical rice transplanter is cost-effective and operation-friendly. It is suitable to plant young seedlings maintaining plant to plant and line to line distance which plays an important role in increasing yield. Moreover, it is easy to take care of the crops planted in rows. It helps in maintaining soil physical properties and is considered to be better from a crop management and productivity point of view. In malignancy of having an edge over the traditional broadcasting, the adoption rate of mechanical transplanters is low due to high primary investment, lack of knowledge in growing mat type nursery, lack of repair and maintenance facility to the end-users, and unavailability of spare parts. Imparting these, available supply, entrepreneurship development, and encouraging custom hire services may be some of the practical results for adding the rice area under mechanical transplanting. This review summarizes the problems and prospects associated with seedling rice transplanting, technological gaps in the adoption of mechanical transplanters in a sustainable manner, and future ways to make transplanters more user-friendly and cost-effective.

Justification of the Application of Resource-Saving Technology for the Restoration of Metal-Intensive Rear Semi-Axles of Trucks Using Hot Plastic Deformation

The article is devoted to the substantiation of technological foundations for the restoration of extremely worn-out, metal-consuming, and resource-consuming parts, in a method consisting of applying a compensating metal wear with subsequent plastic deformation. Currently, there are no technologies for their restoration in a repair facility that guarantee the resilience of the factory product. The proposed technological process of repair consists of butt welding onto the end of the spline semi-axle shank, compensating for the wear of the metal, the volume of which takes into account the losses resulting from the wear of the slots, as well as allowances for their machining. In the example of forging the axle shaft of a truck’s driving axle, the regularities of the plastic flow of metal during part deformation in the stamp are revealed. In the process of hot volumetric upsetting of long cylindrical parts with a variable diameter, it is important to know the possible directions of metal movements, as well as the energy-power characteristics of the process at various stages of forging. The evaluation criteria of the level of perfection of the technology were indicators of resource conservation and efficiency of the recovery route. The technological direction of the conducted research was analyzed, step by step, from the standpoint of saving repair materials and energy resources. The results of theoretical studies are crucial in the design of die tooling, for the manufacture of blanks, when restoring the rear axle shafts of trucks with pressure. Production tests carried out on the models, obtained as a result of mathematical processing of experimental data, confirmed the reliability of the experimental information. The introduction of the proposed set of repair equipment for the restoration of semi-axles will allow the formation of additional production in the region for the recycling of worn-out metal-intensive steel parts of agricultural machinery.

Upaya Peningkatan Administrasi Publik terhadap Kepuasan Masyarakat Dalam Pengurusan E-KTP di Kantor Dinas Kependudukan dan Pencatatan Sipil Aceh Tenggara

This study found that amid numerous issues within the service of e-ID, the Department of Population and Civil Registration Kabupaten Aceh Tenggara tried to create a spread of methods to extend His ministry. The strategy is to develop a structure through best management of the division of labor, collaboration with districts and extra manpower. Development of procedures through the simplification requirements, proactive service and distribution of e-ID cards are printed. Infrastructure development is completed with the addition of printing instrumentality and repair facilities in the District of different services. On the cultural development work, has been finished coaching and extra hours of service.
 Keyword: Strategy, Public Services, e-ID card

Genotoxicity biomarkers in car repair workers from Barranquilla, a Colombian Caribbean City

ABSTRACT Exposure to chemicals and particles generated in automotive repair shops is a common and underestimated problem. The objective of this study was to assess the genotoxic status of auto repair workers with (1) a questionnaire to gather sociodemographic information and self-reported exposure to hazardous chemicals and (2) measurement of various biochemical parameters. Blood and oral mucosa samples were collected from 174 male volunteers from Barranquilla, Colombia, aged 18–55 years: 87 were active car repairmen and 87 were individuals with no known exposure to hazardous chemicals. Peripheral blood lymphocytes were collected for the comet and cytokinesis-blocking micronucleus (CBMN) assays, while oral mucosal epithelium extracted to quantify micronucleated cells (MNC). DNA was extracted to assess polymorphisms in the DNA repair (XRCC1) and metabolism-related genes (GSTT1 and GSTM1) using PCR-RFLP. DNA damage and frequency of micronuclei (MN) in lymphocytes and oral mucosa were significantly higher in exposed compared to control group. In both groups genotypes and allelic variants for XRCC1 and GSTT1 met the Hardy-Weinberg equilibrium (HWE). In contrast, GSTM1 deviated from HWE. In the exposed group genotypic variants were not correlated with DNA damage or MN presence in cells. DNA damage and occurrence of MN in mucosa and lymphocytes correlated with age and time of service (occupational exposure ≥ 3 years). In summary, workers in car repair shops exhibited genotoxic effects depending upon exposure duration in the workplace which occurred independent of DNA repair XRCC1 gene and metabolism genes GSTT1 and GSTM1. Date demonstrate that health authorities improve air quality in auto repair facilities to avoid occupational DNA damage.

More than Bike Lanes—A Multifactorial Index of Urban Bikeability

The present study aims to deduce bikeability based on a collective understanding and provides a methodology to operationalize its calculation based on open data. The approach contains four steps building on each other and combines qualitative and quantitative methods. The first three steps include the definition and operationalization of the index. First, findings from the literature are condensed to determine relevant categories influencing bikeability. Second, an expert survey is conducted to estimate the importance of these categories to gain a common understanding of bikeability and merge the impacting factors. Third, the defined categories are calculated based on OpenStreetMap data and combined to a comprehensive spatial bikeability index in an automated workflow. The fourth step evaluates the proposed index using a multinomial logit mode choice model to derive the effects of bikeability on travel behavior. The expert process shows a stable interaction between the components defining bikeability, linking specific spatial characteristics of bikeability and associated components. Applied components are, in order of importance, biking facilities along main streets, street connectivity, the prevalence of neighborhood streets, green pathways and other cycle facilities, such as rental and repair facilities. The mode choice model shows a strong positive effect of a high bikeability along the route on choosing the bike as the preferred mode. This confirms that the bike friendliness on a route surrounding has a significant impact on the mode choice. Using universal open data and applying stable weighting in an automated workflow renders the approach of assessing urban bike-friendliness fully transferable and the results comparable. It, therefore, lays the foundation for various large-scale cross-sectional analyses.

Major restoration of massive bridge supports

The object of research in this article is the methods of restoring massive bridge supports, depending on the nature and volume of destruction. The work is based on the analysis of publications of domestic and foreign scientists, by the method of theoretical study, analysis and generalization of the material. From an organizational point of view, minor work on the repair of supports can be carried out by the order of the roads themselves, but as for large-scale work, they are sharply different from work on temporary restoration. The repair of damaged supports from a broken part of the masonry is not much different from the repair and reinforcement of supports performed on existing bridges. The greatest difficulties will be the repair of supports in the underwater part. To work on each individual repair facility, organizations with high mobility, skilled labor and a sufficient supply of materials are needed.

ОБЗОР КОНСТРУКЦИЙ МОБИЛЬНЫХ СТАНКОВ ДЛЯ ОБРАБОТКИ КРУПНОГАБАРИТНЫХ ИЗДЕЛИЙ

The repair of large-sized products without a specialized repair facility is usually not available due to the impossibility of ensuring high accuracy when performing mechanical processing. Nevertheless, dismantling and moving large-sized items to the repair facility significantly increase the downtime of the equipment being repaired, or it is technically impossible to perform. Specialized machines that are used to repair large-sized items in such facilities are unique and expensive. They are heavily loaded and this can lead to various risks associated with the timing of the repair. Therefore, it is necessary to reduce the time required for dismantling, moving and processing large-sized items. In this regard, the rejection of these operations in favor of the use of mobile machines will significantly reduce the time and cost of repairs of large equipment. The article discusses domestic and foreign achievements in the field of mobile machines and systems that are used for maintenance and machining of large-sized products on site without dismantling. A number of designs of specialized mobile machines for use in various industries are described.